try to follow PEP8

- fixed most important code after checking with flake8
- ignored code which has to be reworked or removed
+ mark unused code with 'TODO: remove ...'

Change-Id: Ic45e541049e391e2853d29cd64bb0963bd9a2125
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/25053
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/gui/nodectrl.py

@@ -168,7 +168,6 @@ class NodeCtrl(QWidget):
                 print(secop.lib.formatExtendedTraceback())
                 widget = QLabel('Bad configured Module %s! (%s)' % (modname, e))
 
-
             if unit:
                 labelstr = '%s (%s):' % (modname, unit)
             else:
@@ -290,7 +289,7 @@ class DrivableWidget(ReadableWidget):
 
     def update_current(self, value):
         self.currentLineEdit.setText(str(value))
-        #elif self._is_enum:
+        # elif self._is_enum:
         #    member = self._map[self._revmap[value.value]]
         #    self.currentLineEdit.setText('%s.%s (%d)' % (member.enum.name, member.name, member.value))